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Post by smithy1 on Feb 20, 2017 19:49:02 GMT -5
Hi Guys Interesting thought about the proximity switch positioning ..........mmmmmmmmm, thanks Smithy ;-) Cheers John LOL...Yeah...I bought several of the sensors, only cheap Chinese things though...they do work but positioning them in the 6041 inlet housing is a bit difficult....my cheap optical system still works so I'll stick with that for now...I only use it for starting anyway....I pretty much know by the noise now when she's up to self-sustain....plus the blower nozzle starts getting "sucked on" by the engine, even with the blower on full throttle   ....by then she's all good. I'll plonk a couple of sensors and the read-out in a box and shoot them up to you, the read-out is currently setup for reading 6 blades and is able to do lots of different configurations and sensor types. Cheers, Smithy. |
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Post by racket on Feb 20, 2017 20:51:40 GMT -5
Hi Smithy
Yep , the 6041 sucks pretty well , the blower has only a marginally big enough flow at full rpm to satisfy the 6041's idling flow , I think it flows ~0.5 lbs/sec if I remember correctly .
I'll be interested to see what I can do with the sensor...........thanks again :-)
Cheers
John
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Post by racket on Feb 24, 2017 17:08:44 GMT -5
Hi Smithy
Bits arrived safely , thanks for that :-)
Have had a bit of a fiddle with mounting possibilities and it shouldn't be too hard , I'll wait until after testing the slot just in case blocking one of the discharge holes upses things , I might even wait until I have the cover off next time so that I can mount it "properly" via a threaded hole between discharge ports as theres plenty of space to do it .
I'm assuming that the wiring is already connected as required , I just need to add power .
Thanks again
Cheers
John
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Post by smithy1 on Feb 28, 2017 0:39:33 GMT -5
Hi Smithy Bits arrived safely , thanks for that :-) Have had a bit of a fiddle with mounting possibilities and it shouldn't be too hard , I'll wait until after testing the slot just in case blocking one of the discharge holes upses things , I might even wait until I have the cover off next time so that I can mount it "properly" via a threaded hole between discharge ports as theres plenty of space to do it . I'm assuming that the wiring is already connected as required , I just need to add power . Thanks again Cheers John Hi John, Sorry for the late reply, Christine and myself have been on a short 5 day cruise to Tassie, just got back this morning. Good to see the bits arrived ok. Yes, I've done a simple connection loom for it, all you need is to supply 12-24v to the red & black wires, you can cut the large connector and fit whatever you need to suit if you wish, it's just what I had on hand at the time I did some testing. There's two small buttons inside to adjust per the instructions depending on how many blades it's looking at and how you want it to read-out etc... Cheers, Smithy. |
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Post by racket on Feb 28, 2017 1:20:34 GMT -5
Hi Smithy
Good one, hope the trip was enjoyable :-)
I've been making up a threaded sleeve for one of the 10 mm discharge holes , with a bit of a tab welded to it and a screw to hold in place , I should be able to get something working .
Love the "chinese/english" instructions , I think I've translated correctly .
Cheers
John
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Post by turboron on Mar 1, 2017 10:35:53 GMT -5
John, can you and Smithy post the details on the Chinese speed sensors including where to purchase. Thanks, Ron
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Post by racket on Mar 2, 2017 16:47:06 GMT -5
Hi Ron
I might have to leave this one for Smithy as I don't have any idea :-(
Cheers
John
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Post by racket on Mar 2, 2017 21:41:44 GMT -5
Hi Guys Another unsuccessful test run this morning :-( A short video youtu.be/0kbQhOU7tUYA few stats ,starter taken to 33,000 rpm , 0.5 bar P2 , P4s is 8kpa below ambient , TOT 638-740 C , T2 70 C minus ambient 26 give rise of 44 C , 10 psi fuel pressure , 70 psi oil pressure . Both inlet and surge slot "strings" behaving as they should . And another video youtu.be/NIa6gUtmVqU , I'm still trying to digest the info My apologies for the poor quality , it was somewhat rushed as a neighbour was yelling abuse at me at the time for firing her up ...........LOL, he has a limited vocabulary ;-) Cheers John |
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Post by Johansson on Mar 3, 2017 0:18:05 GMT -5
Bugger!  Did you notice any improvements from the previous non-ported run? So the neighbors are yelling even before you start the engine? You really should live around here, the folk in my village are complaining that it was so long ago I ran anything. I try to keep them satisfied by regularly emptying a mag or two with my semi-auto shotgun at the back yard...  Once you have digested the data from this run I am positive you will figure out what is wrong, my faith in you is endless John. Cheers! /Anders |
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Joined: January 1970
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Post by Deleted on Mar 3, 2017 2:40:22 GMT -5
OH :-(
Has the in balance in the egt temperature gone away
It does sound like its moving plenty of air .....
Like Anders, am sure you will work it out, its not the first engine you have made that's caused you problems :-)
All The Best
Andy
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Post by pitciblackscotland on Mar 3, 2017 2:45:28 GMT -5
Hi John,
You can pick your friends but not your neighbours.
Cheers,
Mark.
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Post by smithy1 on Mar 3, 2017 3:37:59 GMT -5
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Post by turboron on Mar 3, 2017 9:22:18 GMT -5
Thanks, Smithy. I have been trying to find something for several years that was affordable.
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Post by turboron on Mar 3, 2017 15:03:15 GMT -5
John/Smithy, I ordered a readout and a probe. However, I noted that the probe reads Iron. Does it also work on Aluminum?
Thanks, Ron
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Post by racket on Mar 3, 2017 19:23:40 GMT -5
Hi Guys
I've been sifting through the video and the one bright point is the T2 temperatures and the comp efficiency .
In the first short video with the engine at 0.5 bar - 1.5 PR the T2 is ~70 deg C , now if we take off the 26 C ambient temp that leaves a temp rise of just 44 C degrees, that works out at an efficiency of ~84% :-)
Theres a similar efficiency at 1.0 bar and at ~1.4 bar where things go wrong with TOT temps spiking at >1,000 C in the jetpipe .
There seems to be more variation between the two jetpipe thermocouples than last test , despite me checking the fuel manifold with gas flames before the recent reassembly , maybe some crap came loose in the manifold , something to checkout .
With comp efficiencies in the >80% range theres no reason why the engine's turb wheel should have problems powering the comp .
The static pressure at the inlet to the diffusing exhaust is interesting , the gauge I'm using is an old VDO boost/vacuum g/g with ambient stuck at ~+22 kpa , at 1.4 bar P2 when the problems start theres a "vacuum" of a tad over 25 kpa -~4 psi , which when taken in conjunction with a P4t of ~4.5 psit, means >8 psi of dynamic pressure/velocity at the entrance............that diffuser really "sucks" the gases out of the turb wheel , it adds another 4 psi to the pressure drop across the stage ..............so guys , put good diffusing exhausts on your freepowers :-)
Cheers
John
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....by then she's all good.
